What do these two changes have in common? making jam silver jewelry tarnishing

Select all that apply.

Both are chemical changes.
Both result in a different type of molecule than was there before.
Both conserve mass.
Both are caused by cooling.​

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Ais your answer to this

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf